Rotary grinding or polishing tool



1,470,957 E, cAvlczcl-n 4komm! alumnus on PoLrsHmo Toon Filed April 12.1920 v Ihvenor. Y Ercole Cavcchi Patented ('ct. 16, 1923.

UNITED STATES TN? FFCE.

ROTARY GRlVNDINGj 0? POLISHING T0011.

Application filed April 12, 1920. Serial No. 373,097.

To all whom it may cm1-cern.'

Be it known that l, ERCOLE CAvIooHr, a citizen of the United States, andresident of Quincy, county of Norfolk, State of Massachusetts, haveinvented an Improvement in Rotary Grinding or Polishing Tools, of whichthe following description, in connection with the accompanying drawing,is a specification, like characters on the drawing representing likeparts.

This invention relates toimprovements in tools for grinding landpolishing machines and the principal object thereof is to providesupporting means for abr-riding members which Will enable the abradingmembers to he readily assembled or replaced when worn.

A further object ci the invention is to provide a grinding toolcomprising a rotatable supporting disk for abrading members having meansby which fluid may be supplied to the working faces of the abradingmembers. Y i

A further object 02 the invention is to prnvide a rotatable lool for andpolishing machines with a fluid receptacle and with means for deliveringthe fluid from said receptacle directly to the grinding faces.

A furthe-r object of the invention is to produce a grinding tool havingahrading members s0 constructed and positioned as to cause thegrirnlingv material and Huid used in the process of grinding to flowtoward thefcenter of the tool in opposition to the centrifugal forceimposed nponA the grinding materialby the rotation of said grindingtool,

Other objects and features of the invention will, more `fully appearfrom ,the follow ing description and the accompanying drawings and willbe. pointed ont in the annexed claims.

A. preferred embodiment of the invention, which is-illustrated herein,is particu-y larly adapted for use in machines of the type disclosed inmy prior Patent No. 1,126,615, granted January 26, 1915, in which atruck supports anV electric meto-r which drives, through suitable gears,a vertical shaft which iS Connected to and rotates the gfmng tool.

11i-the drawings:

Fig. 1 is a bel-tom plan rien of a grinding tool embodying myinaentienlshowing the support for the abrading members, certain o-.E theahrading vrnetnloinsabeing secured to said support and others omittedfor the purpose of clearness of illustration.

Fig. 2 is a side elevation of Vthe grinding tool, and,

Fig. 3 is a perspective view of the preferred form of abrading member orblock.

The abrading tool, which is illustrated in the accompanying drawing,comprises a support for the abrading members, preferably in the form ofa disk l having a central openingr 2 and upon opposite sides of Saidcentral opening upwardly projecting lugs or bosses 3, 4 provided withalined apertures 5, 6 to receive a pin for securim;- said disk to therotatable driving shaft of a grinding or polishing machine of the typedisclosed in my prior patent aforesaid.

The disk 1 desirably is provided with an annular flange 7 locatedadjacent its periphery and extending upvvardl;y from the upper face ofsaid disk to form a fluid receptacle from which fluid, such as Water,may be` supplied to the abrading members through suitable apertures 8extending through the disk.

The under face of the disl-f` l is provided with a. series ci downwardlyextending holders 9 which be in the form of plates secured to the disk,or may be projections formed integral with the disk itself. The holders9 desir-ably are provided with in Wardly converging' walls l0, ll.having re spectively under-cut faces lil, 13 adapted to engage flangeslll, l5 projecting from the sides 16, l? respectively of an abradingblock 18 which is so constructed as to fit the sockets formed b v theconverging sides of adjacent holders.

in the preferred embodiment of the invention illustrated in theaccompanying' drawings the under-cut Walls l0, 1l. of the holders 9incline in a direction rearwardly in respect to planes extending fromthe axis of the disk to the outer ends of said sides,l the inclinationof the rear side preferably being less than that of the forward side,whereby the front faces of the abrading members are caused to inclinerearwardly to radial planes and serve to force the grinding materialtoward the center of the disk in opposition to the normal centrifugalaction of the rotating tool which otherwise would tend to throw thegrinding material out from beneath the grinding tool and the inclinationof the rear faces of the tillV abrading members and their supports serveto counteract the forces which tend to displace the grinding tools whenin use.

It will, however, be understood that di'i'iferent arrangements and formsof grinding tools may be made and that the walls of the holders mayconverge outwardly ir.- stead of inwardly within the scope of myinvention.

The abrading tool 18 desirably is in the form of a somewhat distortedsegment of a circle, and each tool preferably is rovided with a verticalaperture 19 prefera ly having walls substantially parallel respectivelyto the straight and curved walls of the block extending through the toolfrom the upper face to the lower or active grinding face and adapted toregister at its upper end with one of the apertures 8 through the disk1.

In order to assemble the abrading members 18 upon the disk it is merelynecessary to place the upper aceof the abrading members against the faceof the socket between the walls 10, 11 of adjacent holders, and then toSlide the abrading member inwardly until the lflanges 14, 15 engage theunder-cut walls 12, 13 of the holder 9.

In order to secure the abrading members when thus assembled against theoutward movement, which is caused by the centrifugal force of therotating tool, the periphery of the disk desirably may be and isprovided with a series of downwardly extending bosses 20, preferablylocated midway of the distance of the outer end of adjacent holders andtherefore, op osite the central portions of the sockets or the abradingtools which lie between the adjacent holders. The abrading members maythen, when seated in place by longitudinal movement relatively to thewalls of the holders, be locked in position by wedges 21 driven betweenthe outer walls 2201:' said abrading members and the bosses 20.

In order to replace a worn abrading member, therefore, it is merelynecessary to drive out the wedge which holds it in place and slide theabrading member longitudinally outwardly sufficiently to disengage theflanges 14, 15 from the under-cut walls 10,

11, whereupon the abrading member may be` lifted directly from the diskand a fresh one replaced in the manner above described.

In the use of the grinding tool, water or other fluid may be supplied tothe receptacle within the flange 7 from whence it will run by gravitythrough the apertures 8 in the disk and the apertures 19 in the abradingmembers to the surface being ground, thereby insuring the propermoistening of the grinding material or grit which intervenes-between theunder face of the abradin member and the surface being ground:

Y or if no such abrading material is used, will serve to keep the faceof the abrading member sufficiently moist to enable it to operateefficiently.

By reason of the fact that the forward `faces of the abrading membersincline rearwardly from radial planes extending from the center of thedisk t0 their outer ends the water and grit, which is present betweenthe grinding tool and the surface being ground, will always be forcedtoward the center of the grinding tool-in opposition Vto the centrifugalaction of the tool and the proper action of the grinding tool upon thesurface being ground will thereby be maintained.

It will be understood that the embodiment of the invention disclosedherein is of an illustrative character and is not restrictive and thatvarious modifications in form, construction and arrangement of parts maybe made Within the spirit and scope of the'following` claims, and thatthe abrading or polishing members may be constructed of any materialsuitable for the use to which the invention is to be applied.

Having thus described Vmy invention, what I claim as new and desire tosecure by Letters Patent, is:

l. A grinding tool comprisingla rotatable supporting disk having aseries `of holders projecting from the under-face thereof and providedwith inwardly convergingY undercut walls forming sockets for abradingmembers, abrading members of substan-l tially segmental form inclinedrearwardly in respect to radial planes extending from the axis of thedisk to the outer ends of said walls having flanges conformingsubstantially to said under-cut walls, adapted to be secured in saidsockets by inward longitudinal movement `relatively to thewalls of saidholders, apertures in said 'abrading members having walls substantiallyparallel respectively with the straightand curved walls of saidsegmental abrading members, communicating apertures in said disk andmeans for locking said abrading members against longitudinal movementwhen seated in said sockets. Y

2. A grinding tool comprising a rotatable supportingr disk having aseries of holders projecting from the under-face thereof,'pro vided.with inwardly converging under-cut walls forming sockets for abradingmembers, bosses upon the periphe of said disk opposite said sockets,abrading members having` anges corresponding substantially to saidunder-cutwalls' and adapted to be seated in said sockets by longitudinalmovement of said abrading` members relatively to said walls and wedgesintermediate of said abrading members and said bossesl for lock-Vrgrinding tools comprising a block having a1 circular outer wall andconverging straight side walls, the forward side Wall being inclinedrearwardly with respect to a plane radial to the outer wall passingthrough the outer end of said forward side wall, the upper portions ofsaid walls being provided with outwardly projecting flanges saidabrading member being provided with an aperture extending from the upperface to the lower face and having walls substanl0 t-ially parallelrespectively to the converging side walls and the circular outer wall.

In testimony whereof, I have signed my name to this specification.

ERCOLE CAVICCHI.

Certificate of Correction.

It is hereb)v certified that in Letters Patent No. 1,470,957, rentedOctober 16, 1923, upon the application of Ercole Cnvicchi, 0f Quincy,Mtssachusetts, for an improvement in Rot-ary (lrrinding or PolishingTools, errors appear in the printed specification requiring;r rorrection:is follows: Page 2, claim 1, line 100, commencing with the wol-(linclined7 strike ont all to and including,r the word Walls line 103;same page und claim, line 99, after the. word members insert the Wordsinclined rmsrumrfl/r/ in respect to 'radial planes offending rom ffmamis of the disk to the www @mls of wid walls, and that the said Lettersatent should be read with these corrections therein that the Same mayconform to the record of the case in the Patent Office.

Signed and sealed this 27th day of November, A. D., 1923.

[SEAL] KARL FENNING,

Acting Uomflm'ssz'mr 0f Patents,

